There are a few cave systems in California. One of them there are tours you can book that take you floating through underground lakes and into the deep. The test you must pass is to be put in a tight crawl space called “The Womb”. If you freak before the time runs out, you aren’t allowed to proceed.

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"If you go out looking for friends, you are going to find they are very scarce. If you go out to be a friend, you'll find them everywhere."